| 摘要 |
In a piezoelectric acoustic transducer as formed by ultrasonically welding first and second resin casing components together while causing a piezoelectric vibration plate 5 to be laid between a first resin casing component 3 with sound release holes 3c and a second resin casing component 4, the piezoelectric vibration plate 5 is employed as a specific vibration plate of an approximately rectangular planar shape. As a result, Obtained is a small-size piezoelectric acoustic transducer capable of reducing damages of a piezoelectric vibration plate even where its resin casing is assembled by ultrasonic welding techniques. <IMAGE>
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